fix old usage source link
fix links and adjust copy
fix rendering of Go to link:../downloads[Downloads] because adoc is dumb
SIGNIFICANT WHITESPACE! (and a newline with '+')
JBIDE-16708 create modeshape features overview for tools.jboss.org

Adding initial files related to ModeShape Tools.
put modeshape next to the other integration stack features
JBIDE-16708 create modeshape features overview for tools.jboss.org
Made some corrections.